Step-by-Step Growing Guide
Watercress is a semi-aquatic perennial that grows naturally in cool, clean running streams. In gardens, it can be grown in consistently waterlogged soil, in containers set in trays of water, or in repurposed water troughs with a slow trickle of fresh water. It struggles above 22°C and bolts quickly in warm weather — grow it as a spring and fall crop in most climates. Plant in partial shade in midsummer locations. Sow seed in a seed tray kept sitting in a tray of water, or propagate from store-bought bunches by rooting stems in a glass of water on a windowsill — roots appear within a week. Transplant into moist, mineral-rich soil or shallow water-filled containers. pH 6.0–7.5 is ideal. Watercress is a heavy feeder in water; apply a diluted liquid fertilizer weekly if growing in standing water. Keep water fresh and moving if possible — stagnant water promotes disease.